[core] fix forwarding to root in Relation::Combined

rom-rb / rom

Data mapping and persistence toolkit for Ruby

https://rom-rb.org

MIT License

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[core] fix forwarding to root in Relation::Combined #542

Closed solnic closed 5 years ago

solnic commented 5 years ago

When the response from a forwarded method call returns another combined relation, we need to merged nodes and return a new combined relation. Otherwise we were loosing previously combined nodes.

Fixes #525